Opera
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- Opera + Interpretation (Phrasing, dynamics, etc.)
- Opera + Political aspects + History
- Opera + History
- Opera + Yearbooks
- Opera + Casting
- Opera + Almanacs, yearbooks, etc
- Opera + Social aspects + History
- Opera + Production and direction
- Opera + Performances
- Opera + Performance
- Opera + Political aspects
- Opera + Analysis, appreciation
- Opera + Psychological aspects
- Opera + Stage-setting and scenery
- Opera + Stage-setting and scenery + History
- Opera + Dramaturgy
- Opera + Societies, etc
- Opera + Social aspects
- Opera + Production and direction + History
- Opera -- Biography -- Dictionaries
- Opera -- Italy -- 18th century -- Fiction
- Opera -- 20th century
- Opera
- Opera -- Excerpts
- Opera -- Germany
- Opera -- United States -- 21st century
- Opera -- Australia -- Fiction
- Opera -- China
- Opera -- Italy -- History and criticism
- Opera -- 19th century
- Opera -- Soviet Union
- Opera -- New York (N.Y.)
- Opera -- United States -- Dictionaries
- Opera -- New York (State) -- New York -- Pictorial works
- Opera -- United States -- Pictorial works
- Opera -- England -- History
- Opera -- Humor
- Opera -- New York (State) -- New York -- Fiction
- Opera -- Illinois -- Chicago
- Opera -- Chronology
- Opera -- New York (State) -- New York
- Opera -- United States -- Production and direction
- Opera -- Russia (Federation) -- Saint Petersburg -- History
- Opera -- Russia (Federation) -- History and criticism
- Opera -- Peru -- Iquitos -- Drama
- Opera -- 19th century -- History and criticism
- Opera -- England -- London -- 18th century
- Opera -- Encyclopedias
- Opera -- China -- Beijing -- History
- Opera -- Italy -- Fiction
- Opera -- China -- Peking
- Opera -- England -- Kent
- Opera -- Russia (Federation)
- Opera -- United States -- 20th century -- Production and direction
- Opera -- United States
- Opera -- United States -- 20th century
- Opera -- Scores
- Opera -- Bibliography
- Opera -- Compact disc catalogs
- Opera -- Germany -- History and criticism
- Opera -- France -- Paris -- Dictionaries
- Opera -- Texas -- Periodicals
- Opera -- Germany -- 18th century
- Opera -- Austria -- 18th century
- Opera -- Juvenile fiction
- Opera -- Czechoslovakia
- Opera -- France -- Paris
- Opera -- United States -- Interviews
- Opera -- Italy
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- Opera + Societies, etc -- Texas -- Dallas -- Directories
- Opera + Production and direction + History
- Opera + Social aspects
- Opera + Psychological aspects
- Opera + Stage-setting and scenery
- Opera + Production and direction + History -- 19th century
- Opera + Casting
- Opera + Performance
- Opera + Analysis, appreciation
- Opera + Production and direction + History -- 20th century
- Opera + History
- Opera + Production and direction -- Fiction
- Opera + Almanacs, yearbooks, etc
- Opera + Stage-setting and scenery + History -- 20th century
- Opera + Production and direction -- Germany -- Bayreuth
- Opera + Production and direction -- China -- Beijing
- Opera + Dramaturgy
- Opera + Political aspects
- Opera + Interpretation (Phrasing, dynamics, etc.)
- Opera + Production and direction
- Opera + Production and direction -- Italy -- Venice -- History -- 17th century
- Opera + Production and direction -- Juvenile fiction
- Opera + Political aspects + History -- 19th century
- Opera + Production and direction -- Europe -- History
- Opera + Stage-setting and scenery + History -- 19th century
- Opera + Production and direction -- United States
- Opera + Political aspects + History -- 20th century
- Opera + Production and direction -- Texas -- Dallas
- Opera + Performances
- Opera + Social aspects + History
- Opera + Yearbooks
- Opera + Political aspects + History